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Describe the Bug:
Chaos Imps doesn't have haste when its unleash ability has been used and its controller also controls Exava, Rakdos Blood Witch.

Which card did behave improperly ?
not sure

Which update are you using?(date,name)Which type(Duel,Gauntlet,Sealed Deck)
CIA v2, Duel

What exactly should be the correct behavior/interaction ?
Chaos Imps has haste when there's a +1/+1 counter on it and its controller also controls Exava, Rakdos Blood Witch.

Are any other cards possibly affected by this bug ?
not sure

Doesn't work with any creature with unleash tested. Also doesn't work with modular creatures. Does work with hydras (Primordial Hydra tested) and creatures with devour (Mycoloth tested).

It only gave haste to creatures with at least two +1/+1 counters. Fixed in 55208ab.

Exava grants haste to creatures with Unleash (if +1/+1 counter option is chosen) and creatures with Modular now, regardless of the number of +1/+1 counters on a given creature. Seems fixed.